The
XcmsCCCOfColormap function returns the CCC associated with the specified
colormap. Once obtained, the CCC attributes can be queried or modified.
Unless the CCC associated with the specified colormap is changed with XcmsSetCCCOfColormap,
this CCC is used when the specified colormap is used as an argument
to color functions.

The XcmsSetCCCOfColormap function changes the CCC
associated with the specified colormap. It returns the CCC previously associated
with the colormap. If they are not used again in the application, CCCs should
be freed by calling XcmsFreeCCC. Several colormaps may share the same
CCC without restriction; this includes the CCCs generated by Xlib with
each colormap. Xlib, however, creates a new CCC with each new colormap.